Due to the renovation, check in for both Wings are at the East Wing only.
As a Marriott GO, I was very impressed with the room upgrade. Original booking was for a newly renovated deluxe room at the West Wing. Rooms are gorgeous but I could hear the busy KL traffic all night.
The lounge in the West Wing is now open but I was sadly too late for happy hour which is from 530 to 730pm only.